Then you have the Thioglycate ralaxers (or Thio). Thio is a milder chemical.

Some of these chemicals like sodium hydroxide or sodium bromate are actually used in sink cloggers because it eats hair. That is why relaxers are so damaging if they are applied incorrectly or overused. Hope that helps.What are the ingredients of hair relaxer?lye relaxers contain sodium hydroxide as the active ingredient.